CN105830253A - Rectangular secondary battery - Google Patents

Rectangular secondary battery Download PDF

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Publication number
CN105830253A
CN105830253A CN201380079992.5A CN201380079992A CN105830253A CN 105830253 A CN105830253 A CN 105830253A CN 201380079992 A CN201380079992 A CN 201380079992A CN 105830253 A CN105830253 A CN 105830253A
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CN
China
Prior art keywords
terminal
negative
secondary cell
rectangular secondary
connection terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201380079992.5A
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Chinese (zh)
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CN105830253B (en
Inventor
纲木拓郎
西丸翔
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Vehicle Energy Japan Inc
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Hitachi Automotive Systems Ltd
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Publication of CN105830253A publication Critical patent/CN105830253A/en
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Publication of CN105830253B publication Critical patent/CN105830253B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/32—Bonding taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/562—Terminals characterised by the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The present invention addresses the problem of providing a rectangular secondary battery wherein an external terminal is formed with a simple structure, connection resistance of a connection section between a connection terminal and the external terminal is further reduced, and connection resistance of a dissimilar metal conversion section of the external terminal is further reduced. A rectangular secondary battery (100) of the present invention is provided with: a can (101) for housing a power generating element (170); a cover (102) for sealing an opening of the can; an external terminal (105) disposed on the cover; a current collector (190) connected to each of the electrodes of the power generating element; and a connection terminal (115) that connects the current collector and the external terminal to each other by penetrating the cover. The rectangular secondary battery has a configuration wherein: the external terminal (105) has a planar shape disposed along the cover, and is formed of a cladding material wherein two planar sections (105a, 105b) formed of dissimilar metals, respectively, are clad-bonded to each other on the large-width surfaces; and the connection terminal (115) is connected, by welding, to the planar section (105b) of the two planar sections of the external terminal, said planar section (105b) being disposed on the cover side.

Description

Rectangular secondary cell
Technical field
The present invention relates to rectangular secondary cell.
Background technology
In recent years, as the power source of the electric motor car of mixed motivity type or pure electric vehicle etc., have developed the secondary cell of Large Copacity (Wh), be wherein particularly subject to be concerned with the square lithium rechargeable battery that energy density (Wh/kg) is high.
In square lithium rechargeable battery, by the anode electrode of positive active material will be coated with in cathode foil, be coated with the negative electrode of negative electrode active material and being used in anode foil and the barrier film that they are insulated from each other is overlaped winding and forms the rolled electrode group of flat pattern as generator unit.Rolled electrode group electrically connects with positive pole outside terminal and the negative outer terminal of the battery cover being arranged on battery case.Rolled electrode group is accommodated in the battery bucket of battery case, and the peristome of battery bucket is sealed welding by battery cover.After rectangular secondary cell is by injecting electrolyte from the liquid injection hole of the battery case of storage rolled electrode group, utilizes fluid injection bolt seal to close liquid injection hole and sealed welding by laser welding and formed.
By utilizing the conductive components such as busbar positive pole outside terminal and the negative outer terminal of multiple rectangular secondary cells to be electrically connected and fetch formation Battery pack.Busbar is by utilizing bolt, nut and outside terminal screw threads for fastening, or is connected to rectangular secondary cell by welding with outside terminal.
In patent documentation 1, the outside terminal connecting multiple secondary cell includes the coating member being made up of al and ni and from the internal connection terminal (patent documentation 1, electrode derives pin) being made up of aluminum drawn of secondary cell.Secondary cell described in patent documentation 1 is riveted fixing in the nickel side connecting terminal and outside terminal engaged with generator unit.
In patent documentation 2, connecting multiple rectangular secondary cell by busbar is welded to outside terminal, the outside terminal connected is respectively aluminum and copper alloy, and busbar includes the coating member that aluminium alloy and copper alloy are engaged by dissimilar metal and formed.Busbar described in patent documentation 2 is to utilize leptoprosopy to abut the aluminium alloy and copper alloy engaged, and the connection terminal consisted of with by copper alloy the copper alloy connecting terminal and busbar constituted with by aluminium alloy by the aluminium alloy of busbar respectively welds and connects.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2003-045408 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2011-060623 publication
Summary of the invention
Invention is wanted to solve the technical problem that
In the secondary cell described in above-mentioned patent documentation 1, the connection terminal being made up of aluminium alloy engaged with generator unit, by fixing for the nickel side riveting of converted to aluminium alloy and nickel dissimilar metal cladding outside terminal and electrically connect, so contact resistance is big, through its contact resistance long-time it is also possible to change.
Secondary cell described in above-mentioned patent documentation 2 is the secondary cell that busbar is connected to outside terminal by welding, including the outside terminal being made up of aluminium alloy and copper alloy, busbar for being connected with other secondary cell is to utilize the conversion of leptoprosopy dissimilar metal to obtain the cladding busbar of (end face is coated with joint each other) aluminium alloy and the copper alloy of flat board dress, and the joint resistance of the dissimilar metal converter section of aluminium alloy and copper alloy likely becomes big.
The present invention makes in view of the above-mentioned problems, its object is to provide a kind of rectangular secondary cell, its outside terminal is formed with simple structure, it is possible to reduce the contact resistance of the connecting portion connecting terminal and outside terminal and the joint resistance of the dissimilar metal converter section of outside terminal respectively.
For solving the technical scheme of technical problem
Solve the rectangular secondary cell of the present invention of above-mentioned technical problem, it is characterised in that including: there is the generator unit of electrode；Receive the bucket of described generator unit；Seal the lid of the opening of described bucket；The outside terminal covered described in being arranged in；The collector body being connected respectively with each electrode of described generator unit；And through described lid and connect the connection terminal between described collector body and described outside terminal, described outside terminal is made up of coating member, described coating member has the writing board shape along described lid configuration, and two flat parts being made up of dissimilar metal each other of described coating member utilize wide bread each other to cover joint, described connection terminal and the flat part solder joints being arranged in described lid side in two flat parts of described outside terminal.
Invention effect
According to the present invention, a kind of rectangular secondary cell can be provided, its outside terminal is formed with simple structure, it is possible to the joint resistance of the dissimilar metal converter section of the contact resistance reducing the connecting portion connecting terminal and outside terminal respectively and the outside terminal being made up of coating member.
Accompanying drawing explanation
Fig. 1 is the stereoscopic figure of the rectangular secondary cell of an embodiment of the rectangular secondary cell of the present invention.
Fig. 2 is the exploded perspective view of the structure representing rectangular secondary cell.
Fig. 3 is the axonometric chart representing rolled electrode group.
Fig. 4 is the exploded perspective view representing lid assembly.
Fig. 5 A is the exploded view of the structure of the negative side representing lid assembly with cross section.
Fig. 5 B is the exploded view of the structure of the negative side representing lid assembly with cross section.
Fig. 5 C is the assembling figure of the structure of the negative side representing lid assembly with cross section.
Fig. 5 D is the assembling figure of the structure of the negative side representing lid assembly with cross section.
Fig. 6 A is the exploded view of the structure of the side of the positive electrode representing lid assembly with cross section.
Fig. 6 B is the assembling figure of the structure of the side of the positive electrode representing lid assembly with cross section.
Fig. 6 C is the assembling figure of the structure of the side of the positive electrode representing lid assembly with cross section.
Fig. 7 A is the figure representing and the front end of the collector body connecting portion of negative outer terminal riveting operation on the current collector.
Fig. 7 B is the figure representing and the front end of the collector body connecting portion of negative outer terminal riveting operation on the current collector.
Fig. 8 A is to represent that negative outer terminal and negative pole connect the exploded view of the riveted structure of terminal with cross section.
Fig. 8 B is to represent that negative outer terminal and negative pole connect the exploded view of the riveting fixed structure of terminal with cross section.
Fig. 9 A is to represent that negative outer terminal and negative pole connect the assembling figure of the example being welded and fixed structure of terminal with cross section.
Fig. 9 B is the major part enlarged drawing of Fig. 9 A.
Figure 10 A is to represent that negative outer terminal and negative pole connect the assembling figure of the example being welded and fixed structure of terminal with cross section.
Figure 10 B is the major part enlarged drawing of Figure 10 A.
Figure 11 A is to represent that negative outer terminal and negative pole connect the assembling figure of the example being welded and fixed structure of terminal with cross section.
Figure 11 B is the major part enlarged drawing of Figure 11 A.
Figure 12 A is to represent that negative outer terminal and negative pole connect the assembling figure of the example being welded and fixed structure of terminal with cross section.
Figure 12 B is the major part enlarged drawing of Figure 12 A.
Detailed description of the invention
[the first embodiment]
Hereinafter, referring to the drawings the embodiment of the rectangular secondary cell of the present invention is illustrated.
Fig. 1 is the stereoscopic figure of the rectangular secondary cell 100 of the embodiment being denoted as rectangular secondary cell, and Fig. 2 is the exploded perspective view of the structure representing rectangular secondary cell 100.
As it is shown in figure 1, rectangular secondary cell 100 includes having battery bucket 101 and the battery case of battery cover 102.The material of battery bucket 101 and battery cover 102 is aluminum or aluminum alloy etc..Battery bucket 101 is formed as the flat rectangular box of one end open by implementing deep-draw to process.Battery bucket 101 includes the upright wide a pair side plate 101a of the base plate 101c of rectangular flat shape, each long leg from a pair long leg of base plate 101c and the upright a pair narrow side 101b of each short leg from the pair of short edges portion of base plate 101c.
As in figure 2 it is shown, be accommodated with the rolled electrode group 170 (with reference to Fig. 3) being held in lid assembly 107 (with reference to Fig. 4) in battery bucket 101.The positive electrode collector 180 engaged with the anode electrode 174 (with reference to Fig. 3) of rolled electrode group 170 and the negative electrode collector 190 and the rolled electrode group 170 that engage with the negative electrode 175 (with reference to Fig. 3) of rolled electrode group 170 are accommodated in battery bucket 101 with the state covered by insulation shell 108.The material of insulation shell 108 is the resin that polypropylene etc. has insulating properties, with battery bucket 101 and rolled electrode group 170 electric insulation.
As depicted in figs. 1 and 2, battery cover 102 is rectangular flat shape, is hermetically laser welded in the way of the opening of closing battery bucket 101.That is, the opening of battery cover 102 sealed cell bucket 101.As it is shown in figure 1, in the positive pole outside terminal 104 that battery cover 102 is configured with the anode electrode 174 with rolled electrode group 170 and negative electrode 175 (with reference to Fig. 3) electrically connects and negative outer terminal 105.
As shown in Figure 2, positive pole outside terminal 104 electrically connects with the anode electrode 174 (with reference to Fig. 3) of rolled electrode group 170 via positive electrode collector 180, and negative outer terminal 105 electrically connects with the negative electrode 175 (with reference to Fig. 3) of rolled electrode group 170 via negative electrode collector 190.Therefore, power to external equipment via positive pole outside terminal 104 and negative outer terminal 105, or outside generation power is supplied to rolled electrode group 170 via positive pole outside terminal 104 and negative outer terminal 105 and is charged therein.
As in figure 2 it is shown, be provided through the liquid injection hole 106a in injecting the electrolyte into battery case at battery cover 102.Liquid injection hole 106a is sealed by fluid injection bolt 106b after injecting electrolyte.Dissolving lithium hexafluoro phosphate (LiPF in the organic solvent of the carbonates such as vinyl carbonate such as can be used as electrolyte6) etc. the nonaqueous electrolytic solution that obtains of lithium salts.
Battery cover 102 is provided with air bleeding valve 103.Battery cover 102 part thin-walled property is formed by air bleeding valve 103 by punch process.Alternatively, it is also possible to thin film component to be arranged on the opening of battery cover 102 by laser welding etc., thus using thin-walled portion as air bleeding valve.The air bleeding valve 103 pressure within rectangular secondary cell 100 causes battery case because of abnormal heating generation gases such as internal short-circuits splits when rising and reach authorized pressure, discharges gas from inside thus reduces the pressure in battery case.
With reference to Fig. 3, rolled electrode group 170 is illustrated.Fig. 3 is the axonometric chart representing rolled electrode group 170, it is shown that the winding of rolled electrode group 170 is terminated the state that side is launched.Rolled electrode group 170 as generator unit is wound into flat pattern by the anode electrode 174 of long shape and negative electrode 175 clip barrier film 173a, 173b betwixt carrys out cambium layer stack structure around winding central shaft W.
Anode electrode 174 is formed with the layer 176 of positive active material mixture on the two sides of cathode foil 171.Positive active material mixture is that hybrid adhesive (binder, binding agent) obtains in positive active material.Negative electrode 175 is formed with the layer 177 of negative electrode active material mixture on the two sides of anode foil 172.Negative electrode active material mixture is that hybrid adhesive (binder, binding agent) obtains in negative electrode active material.
Cathode foil 171 be thickness be the aluminium foil about 20～30 μm, anode foil 172 is Copper Foil that thickness is about 15～20 μm.The raw material of barrier film 173a, 173b is the micro-porous polyvinyl resin that lithium ion can pass through.Positive active material is the lithium-containing transition metal oxides such as LiMn2O4, and negative electrode active material is can reversibly occlusion and release the material with carbon element such as graphite of lithium ion.
The width of rolled electrode group 170, in the both ends on the direction of i.e. orthogonal with coiling direction winding center axle W, a side is the laminated section of anode electrode 174, and the opposing party is the laminated section of negative electrode 175.The laminated section of the anode electrode 174 being arranged on one end is the positive pole uncoated portion i.e. exposed division stratification of cathode foil 171 being formed without positive active material mixture layer 176.The laminated section of the negative electrode 175 being arranged on the other end is the negative pole uncoated portion i.e. exposed division stratification of anode foil 172 being formed without negative electrode active material mixture layer 177.The laminated section in positive pole uncoated portion and the laminated section in negative pole uncoated portion are the most previously extruded, and be connected with positive electrode collector 180 and the negative electrode collector 190 of lid assembly 107 (with reference to Fig. 4) described later respectively by ultrasonic bonding, form electrode group assembly 109 (with reference to Fig. 2).
With reference to Fig. 4, Fig. 5 A～Fig. 5 D, Fig. 6 A～Fig. 6 C, the structure of lid assembly 107 is described in detail.Fig. 4 is the exploded perspective view representing lid assembly 107, and Fig. 5 A～Fig. 5 D is the sectional view of the structure of the negative side representing lid assembly 107.Fig. 5 A is the line C-C broken sectional of Fig. 4.Fig. 5 B is the sectional view representing the state assembling the negative outer terminal 105 being made up of aluminium alloy and copper alloy and negative pole connection terminal 115.Fig. 5 C is the sectional view of the state representing the structure member assembling lid assembly 107, it is shown that the state before the leading section 115b of axle portion 115a is inserted in riveting.Fig. 5 D is the line A-A broken sectional of Fig. 1, it is shown that the state after the leading section 115b of axle portion 115a is inserted in riveting.
Fig. 6 A～Fig. 6 C is the sectional view of the structure of the side of the positive electrode representing lid assembly 107.Fig. 6 A is the line D-D broken sectional of Fig. 4.Fig. 6 B is the sectional view of the state of the structure member representing the side of the positive electrode assembling lid assembly 107, it is shown that the state before the leading section 114b of axle portion 114a is inserted in riveting.Fig. 6 C is the line B-B broken sectional of Fig. 1, it is shown that the state after the leading section 114b of axle portion 114a is inserted in riveting.
As shown in Figure 5A, the negative side of lid assembly 107 includes battery cover 102, is arranged on the negative outer terminal 105 of one end of battery cover 102, negative pole connection terminal 115, outer insulator 160, internal insulator 165, pad 169 and negative electrode collector 190 and constitutes.
Fig. 5 B illustrates that negative outer terminal 105 and negative pole connect the figure of terminal 115 integration.Negative outer terminal 105 has the rectangular writing board shape of the upper surface configuration along battery cover 102, and surface is formed with the busbar composition surface 105e for solder joints busbar 123 thereon.Negative outer terminal 105 includes that two flat parts being made up of dissimilar metal each other utilize wide bread each other to cover the coating member of combination.In the present embodiment, utilized wide face each other to be engaged, by dissimilar metal, the flat coating member obtained by the aluminium alloy portion 105a (the first alloy portion) with writing board shape and copper alloy portion 105b (the second alloy portion) to constitute, it is provided with copper alloy portion 105b, aluminium alloy portion 105a in battery cover 102 side and is disposed substantially away from the side of battery cover 102.Negative pole connects terminal 115 and is electrically connected to negative outer terminal 105 by laser welding.Negative pole connects terminal 115 solder joints two flat parts to negative outer terminal 105, i.e. the copper alloy portion 105b as the flat part being arranged in battery cover 102 side in aluminium alloy portion 105a and copper alloy portion 105b.It is copper alloy that negative pole connects the material of terminal 115, and negative pole connects terminal 115 and negative outer terminal 105 is laser welded each other with same metal.
In the length direction middle position of the copper alloy portion 105b of negative outer terminal 105, it is provided with the negative outer terminal connecting portion 105c connecting terminal 115 for connecting negative pole.Negative outer terminal connecting portion 105c depression is formed at copper alloy portion 105b, is made up of the recess of certain diameter and the circle with prescribed depth.
Negative pole connects state and the negative outer terminal connecting portion 105c laser welding that terminal 115 embeds with cardinal extremity.Negative pole connects terminal 115 and has the axle portion that the inserts 115a of pole shape, in expanding flange portion 115c of the cardinal extremity inserting axle portion 115a with at the cylindric leading section 115b of the front end undergauge inserting axle portion 115a.Negative outer terminal connecting portion 105c has the aperture that the half degree of depth of the thickness of flange portion 115c is relative with the outer peripheral face of flange portion 115c with inner peripheral surface.Negative pole connection terminal 115 and negative outer terminal 105 are embedded into the negative outer terminal connecting portion 105c of negative outer terminal 105 by flange portion 115c of negative pole connection terminal 115 and the outer peripheral face of flange portion 115c welds with the boundary member complete cycle continuous laser of the inner peripheral surface of negative outer terminal connecting portion 105c and is engaged with each other.It addition, form weld part 115d (with reference to Fig. 9 B) in this bonding part.
Negative outer terminal 105 leans on the position of length direction both sides at the ratio negative outer terminal connecting portion 105c of copper alloy portion 105b, has a pair groove 105h extended along short side direction.A pair groove 105h be arranged on negative outer terminal 105, busbar 123 be welded to the position between welding position (not shown) and negative outer terminal 105c of busbar composition surface 105e, when power acts on negative outer terminal 105 from busbar 123 (with reference to Fig. 5 D), by bending and absorbing power at groove 105h energetically, the deformation of suppression pad 169.
Pad 169 has cylindrical portion 169a of the short axle being embedded to the axle portion that the inserts 115a that negative pole connects terminal 115 and the flange part 169b of the base end part radial expansion in cylindrical portion 169a.
Then, Fig. 5 C is the sectional view of state of the structure member representing the negative side assembling lid assembly 107, it is shown that the state before riveting leading section 115b.As shown in Figure 5 B, by laser welding, shape all-in-one-piece negative outer terminal 105 and negative pole connection terminal 115 insert the inserting hole in the seat surface portion 191 being opened on negative electrode collector 190 by inserting axle portion 115a, and leading section 115b is expanding and rivets, and then caulking part 115e laser welding 142 is electrically connected to negative electrode collector 190.Negative pole connects terminal 115 and is installed on battery cover 102 across outer insulator 160 and pad 169.Negative electrode collector 190 is installed on battery cover 102 across internal insulator 165.
The material of outer insulator 160 and internal insulator 165 is the resin that polypropylene (PP) etc. has insulating properties.The material of pad 169 is the resin that tetrafluoroethylene-perfluoro alkyl vinyl ether copolymer (PFA) etc. has insulating properties.
Fig. 5 D is the sectional view of the state of the structure member representing the negative side assembling lid assembly 107, it is shown that the state after riveting leading section 115b.Negative pole connects terminal 115 and inserts in the through hole 102h of battery cover 102 and the through hole of internal insulator 165 with the outer state being installed to insert axle portion 115a of pad 169.As shown in the figure, it is formed at the stage portion inserted between axle portion 115a and leading section 115b to abut with seat surface portion 191, when clipping the flange part 169b of pad 169 between the outer surface of flange portion 115c and battery cover 102, the front end of leading section 115b is expanding, it is riveted on seat surface portion 191, forms caulking part 115e.
At the upper surface of battery cover 102, it is provided with two the convex strip portions 102j forming seal point between pad 169.Two convex strip portions 102j are arranged on the position relative with the flange part 169b of pad 169, are respectively provided with week shape continuous print shape centered by the position identical with the center of through hole 102h.It is pressed into the two convex strip portions by the flange part 169b of pad 169 and forms seal point, seal.
Fig. 6 A～Fig. 6 C illustrates the lid assembly 107 of side of the positive electrode.
As shown in Figure 6A, the side of the positive electrode of lid assembly 107 includes battery cover 102, is arranged on the positive pole outside terminal 104 of one end of battery cover 102, anode connection terminal 114, outer insulator 160, internal insulator 165, pad 169 and positive electrode collector 180 and constitutes.Positive pole outside terminal 104 has the rectangular writing board shape of the upper surface configuration along battery cover 102, and surface is formed with the busbar composition surface 104e for solder joints busbar 123 thereon.Anode connection terminal 114 forms as one with positive pole outside terminal 104.Anode connection terminal 114 has inserts axle portion 114a and the leading section 114b of the tubular at the front end undergauge inserting axle portion 114a from the prominent pole shape of the lower surface of positive pole outside terminal 104.
Positive pole outside terminal 104 is leaning on the position of length direction both sides than anode connection terminal 114, has a pair groove 104h extended along short side direction.A pair groove 104h be arranged on positive pole outside terminal 104, busbar 123 be welded to the position between welding position (not shown) and anode connection terminal 114 of busbar composition surface 104e, when power acts on positive pole outside terminal 104 from busbar 123 (with reference to Fig. 5 D), by bending and absorbing power at groove 104h energetically, the deformation of suppression pad 169.
Fig. 6 B is the sectional view of the state of the structure member representing the side of the positive electrode assembling lid assembly 107, it is shown that the state before riveting leading section 104b.
Positive pole outside terminal 104 and anode connection terminal 114 insert the inserting hole in the seat surface portion 181 being opened on positive electrode collector 180 by the axle portion that the inserts 114a of anode connection terminal 114, and expanding and form caulking part 114e from the leading section 114b that inserting hole is prominent.Then, and then by caulking part 114e laser welding (not shown) it is electrically connected to positive electrode collector 180 to seat surface portion 181.Anode connection terminal 114 is installed on battery cover 102 across outer insulator 160 and pad 169.Positive electrode collector 180 is installed on battery cover 102 across internal insulator 165.The material of outer insulator 160 and internal insulator 165 is the resin that polypropylene (PP) etc. has insulating properties.The material of pad 169 is the resin that tetrafluoroethene perfluoroalkyl vinyl ether copolymer (PFA) etc. has insulating properties.
Fig. 6 C is the sectional view of the state of the structure member representing the side of the positive electrode assembling lid assembly 107, it is shown that the state after riveting leading section 114b.Anode connection terminal 114 is inserted in the through hole 102h of battery cover 102 and the through hole of internal insulator 165 with the outer state being installed to insert axle portion 114a of pad 169.As shown in the figure, it is formed at the stage portion inserted between axle portion 114a and leading section 114b to abut with seat surface portion 181, when clipping the flange part 169b of pad 169 between the outer surface of positive pole outside terminal 104 and battery cover 102, the front end of leading section 114b is expanding, it is riveted on seat surface portion 181, forms caulking part 114e.
With reference to Fig. 7 A, Fig. 7 B, staking process is illustrated.It addition, the staking process to the staking process of the caulking part 114e in the seat surface portion 181 of positive electrode collector 180 and the caulking part 115e in the seat surface portion 191 of anticathode collector body 190 is identical operation, so illustrating as the staking process representing anticathode side.
In staking process, as shown in Figure 7 A, when the planar portions of mould 20 abuts to the busbar composition surface 105e as riveting upper surface part, the mould 22 of nose circle cone-shaped is pressed into the riveted holes 115f of the inner side as leading section 115b, thus cylindric leading section 115b be extruded and expand.Thus, negative electrode collector 190, negative pole connect terminal 115, negative outer terminal 105, pad 169, outer insulator 160 and internal insulator 165 and fix with battery cover 102 temporarily.
The mould 20 of riveting machine is provided with pin-shaped projection 21, this projection 21 is inserted from the through hole 105f being opened on busbar composition surface 105e and is fitted to be formed at the recess 154 in the cardinal extremity face that negative pole connects terminal 115, it is possible to easily and highly accurately carry out negative outer terminal 105, negative pole connects the terminal 115 location relative to riveting machine.Therefore, it is possible to the mould 22 of the nose circle cone-shaped of riveting machine to be pressed into accurately the riveted holes 115f of the leading section 115b of cylindrical shape.
The kind of the mould 22 of nose circle cone-shaped is replaced by successively the mould that toe angle is bigger, and is pressed into the riveted holes 115f of leading section 115b, gradually leading section 115b is extruded laterally and expand.As shown in Figure 7 B, by when there is the vertical view parallel with battery cover 102 be round shape planar portions 23a and from the vertical view that planar portions 23a tilts to battery cover 102 time be that the mould 23 of circular rake 23b is pressed into leading section 115b, be circular caulking part 115e when being consequently formed vertical view.Thus, negative electrode collector 190, negative outer terminal 105, pad 169, outer insulator 160 and internal insulator 165 fasten with battery cover 102 and form one.Additionally, the caulking part 114e of anode connection terminal 114 is riveted on the seat surface portion 181 of positive electrode collector 180 too, and thus positive electrode collector 180, positive pole outside terminal 104, pad 169, outer insulator 160 and internal insulator 165 fasten with battery cover 102 and form one.
Rectangular secondary cell 100 is connected with other not shown rectangular secondary cell by busbar 123, constitutes Battery pack.In the present embodiment, Fig. 5 D is connected with the outside terminal 104,105 of rectangular secondary cell 100 by laser welding with the busbar 123 shown in two chain-dotted lines.Busbar 123 is aluminium alloy, is aluminium alloy welding each other with positive pole outside terminal 104 and negative outer terminal 105.Therefore, it is the joint of homogenous metal, engages easily, and the increase of contact resistance can be suppressed.
Fig. 9 A is to represent that negative outer terminal and negative pole connect the assembling figure of the example being welded and fixed structure of terminal with cross section, and Fig. 9 B is the major part enlarged drawing of Fig. 9 A.
As it has been described above, negative outer terminal 105 has the negative outer terminal connecting portion 105c being made up of recess at the copper alloy portion 105b of its lower face side, wherein it is embedded with negative pole and connects flange portion 115c of terminal 115.The degree of depth of negative outer terminal 105c connects the thickness of flange portion 115c of terminal 115 less than negative pole, and the base end side of flange portion 115c is embedded into negative outer terminal connecting portion 105c, and the front of flange portion 115c is more prominent than copper alloy portion 105b.
Further, the laser beam welded from the direction irradiating laser tilted relative to the boundary member between outer peripheral face and the lower surface of copper alloy portion 105b of flange portion 115c, thus carry out fillet weld, form weld part 115d.
Weld part 115d is arranged in the position of the radial outside leaning on negative pole connection terminal 115 than the seal point of pad 169.Further, the position of radial outside is more being leaned on to be configured with outer insulator 160 than weld part 155d.Therefore, it is possible to prevent from being formed leakage path between the upper surface and the flange part 169b of pad 169 of battery cover 102, it is possible to obtain high-air-tightness.
According to the above-mentioned structure that is welded and fixed, the base end side of flange portion 115c is embedded into negative outer terminal connecting portion 105c, so such as being applied by busbar 123 anticathode outside terminal 105 can resist during the power of in-plane, it is possible to obtain high mechanical properties.
It addition, it is generally rectangular shape that negative outer terminal 105 has when connecting the upwardly extending vertical view in terminal 115 side away from each other from negative pole, it is possible to the broader busbar of engaged width 123.Therefore, it is possible to make the position of welding busbar 123 connect terminal 115 away from negative pole, it is possible to prevent welding heat affected pad 169.Further, when constituting Battery pack, it is possible to foreshorten to the distance of rectangular secondary cell adjacent one another are, it is possible to reduce resistance.In addition, such as when the power acted on by busbar 123 anticathode outside terminal 105 on the direction that vertical direction promotes, deflection relative to negative outer terminal 105, it can be ensured that the distance at the position of longer busbar 123 welding connecting terminal 115 to busbar composition surface 105e from negative pole.
Figure 10 A is to represent that negative outer terminal and negative pole connect the assembling figure of the example being welded and fixed structure of terminal with cross section, and Figure 10 B is the major part enlarged drawing of Figure 10 A.
In the structure example shown in Figure 10 A, Figure 10 B, seal point is arranged between flange portion 115c that the flange part 169b of pad 169 is connected terminal 115 with negative pole.At the lower surface of flange portion 115c, it is provided with all two convex strip portions 115j of shape continuous print, the flange part 169b of pad 169 centered by the position identical with the center inserting axle portion 115a and is pressed against this two convex strip portions 115j formation seal points, seal.Therefore, it is possible to prevent from connecting at negative pole forming leakage path between flange portion 115c and the flange part 169b of pad 169 of terminal 115, it is possible to obtain high-air-tightness.
Figure 11 A is to represent that negative outer terminal and negative pole connect the assembling figure of the example being welded and fixed structure of terminal with cross section, and Figure 11 B is the major part enlarged drawing of Figure 11 A.
Negative outer terminal 105 has the negative outer terminal connecting portion 105c being made up of recess at the copper alloy portion 105b of its lower face side, is wherein embedded with negative pole and connects flange portion 115c of terminal 115.The degree of depth of negative outer terminal connecting portion 105c is equal with the thickness of flange portion 115c that negative pole connects terminal 115, and when flange portion 115c is embedded into negative outer terminal connecting portion 105c and is fixed, flange portion 115c becomes a face with copper alloy portion 105b.
Then, at the laser beam boundary member irradiating laser of the outer peripheral face of flange portion 115c and the inner peripheral surface of negative outer terminal connecting portion 105c welded with the axially in parallel direction inserting axle portion 115a, carry out slot welding, form weld part 115h.
Battery cover 102 is provided with two convex strip portions 102j for forming seal point between pad 169.Article two, convex strip portions 102j is arranged on the position relative with the flange part 169b of pad 169, is respectively provided with week shape continuous print shape centered by the position identical with the center of through hole 102h.Form seal point by pressing the flange part 169b of these two convex strip portions pressing pads 169, seal.
Weld part 115d is arranged in the seal point than pad 169 by leaving the position of radial outside that negative pole connects the axle portion that the inserts 115a of terminal 115.Further, the position of radial outside is more being leaned on to be configured with outer insulator 160 than weld part 155d.Therefore, it is possible to prevent from being formed leakage path between the upper surface and the flange part 169b of pad 169 of battery cover 102, it is possible to obtain high air-tightness.
Figure 12 A is to represent that negative outer terminal and negative pole connect the assembling figure of the example being welded and fixed structure of terminal with cross section, and Figure 12 B is the major part enlarged drawing of Figure 12 A.
In the structure example shown in Figure 12 A, Figure 12 B, compared with the structure example shown in Figure 11 A, Figure 11 B, the position of seal point is different, and seal point is arranged between flange portion 115c that the flange part 169b of pad 169 is connected terminal 115 with negative pole.Lower surface in flange portion 115c is provided with all two convex strip portions 115j of shape continuous print, the flange part 169b of pad 169 centered by the position identical with the center inserting axle portion 115a and is pressed against these two convex strip portions 115j and forms seal point, seal.Further, weld part 115d is arranged in the seal point than pad 169 by leaving the position of radial outside that negative pole connects the axle portion that the inserts 115a of terminal 115, is configured with outer insulator 160 in the more position by radial outside than weld part 155d.Therefore, it is possible to prevent from connecting at negative pole forming leakage path between flange portion 115c and the flange part 169b of pad 169 of terminal 115, it is possible to obtain high air-tightness.
[the second embodiment]
In the first above-mentioned embodiment, to utilize laser welding to be illustrated as a example by negative outer terminal 105 and negative pole are connected the structure of terminal 115 integration, but negative outer terminal 105 and negative pole can also be connected terminal 115 and rivet fixing, and then carry out laser welding.Fig. 8 illustrates its assembling mode.
Fig. 8 A be negative pole connect terminal 115 base end part 115g be riveted before state, Fig. 8 B illustrates the state after riveting.
Negative pole connects in terminal 115, and base end part 115g inserts in the through hole 105g of negative outer terminal 105.Further, as the staking process shown in Fig. 7 A, Fig. 7 B, riveting is fixed on the exposed surface being positioned at battery bucket 1 outer side of negative outer terminal 105.After the fixing negative outer terminal 105 of riveting and negative pole connect terminal 115, in the mode shown in Fig. 5 B, the boundary member of the outer peripheral face of flange portion 115c and the copper alloy portion 105b of negative outer terminal 105 is hermetically laser welded together continuously at the complete cycle of flange portion 115c, thus is electrically connected.
According to above-mentioned present embodiment, it is possible to play action effect as follows.
In accordance with the invention it is possible to provide a kind of rectangular secondary cell, its outside terminal is formed with simple structure, it is possible to reduce the contact resistance of the connecting portion connecting terminal and outside terminal and the joint resistance of the dissimilar metal converter section of outside terminal respectively.
As long as not damaging and hindering inventive feature, the invention is not restricted to above-mentioned embodiment, in the range of the technological thought of the present invention it is conceivable that other embodiments be also contained in the scope of the present invention.
Such as, in the above-described embodiment, use by negative outer terminal 105 and be illustrated in case of including aluminium alloy portion 105a and the coating member of copper alloy portion 105b and connecting the busbar 123 of aluminium alloy, but such as can also use and be made up of negative outer terminal 105 copper alloy and positive pole outside terminal 104 uses and includes copper alloy portion and the coating member in aluminium alloy portion and connect the structure of busbar of copper alloy.
It addition, seal point is preferably provided between pad 169 and battery cover 102 or pad 169 and negative pole connect between terminal 115 at least one party, it is also possible to be arranged on both.
Description of reference numerals
100 rectangular secondary cells
101 barrels
102 lids
105 negative outer terminal (outside terminal)
105a aluminium alloy portion (flat part)
105b copper alloy portion (flat part)
115 connect terminal
190 collector bodies.
Claims (according to the amendment of treaty the 19th article)
1. a kind of rectangular secondary cell (after correction), it is characterised in that including:
There is the generator unit of electrode；
Receive the bucket of described generator unit；
Seal the lid of the opening of described bucket；
The outside terminal covered described in being arranged in；
The collector body being connected respectively with each electrode of described generator unit；With
Through described lid and connect the connection terminal between described collector body and described outside terminal,
Described outside terminal is made up of coating member, described coating member has the writing board shape along described lid configuration, and two flat parts being made up of dissimilar metal each other of described coating member utilize wide bread each other to cover joint, in these two flat parts, the flat part being arranged in described lid side is homogenous metal with the described terminal that is connected
Described connection terminal and the flat part solder joints being arranged in described lid side in two flat parts of described outside terminal,
Described outside terminal has the outside terminal connecting portion being hollowly formed at the flat part being arranged in described lid side,
The state that described connection terminal is embedded into described outside terminal connecting portion with cardinal extremity is hermetically laser welded.
2. (delete)
3. rectangular secondary cell as claimed in claim 1 (after correction), it is characterised in that:
Described outside terminal connecting portion has the recess of circle, and described recess diameter is certain and has prescribed depth,
Described connection terminal has the axle portion that inserts inserting in the through hole being opened on described lid and inserts, at this, the flange portion that the cardinal extremity in axle portion is expanding,
The flange portion of described connection terminal is embedded into the recess of described outside terminal connecting portion, and the outer peripheral face of this flange portion is hermetically laser welded together with the boundary member of the inner peripheral surface of described recess.
4. rectangular secondary cell as claimed in claim 3, it is characterised in that:
There is the pad being clipped between described connection terminal and described lid,
At least one party in described connection terminal and described lid is provided with the convex strip portions for forming seal point.
5. rectangular secondary cell as claimed in claim 4, it is characterised in that:
Said two alloy portion is aluminium alloy portion and copper alloy portion.
6. rectangular secondary cell as claimed in claim 5, it is characterised in that:
Described outside terminal includes positive pole outside terminal and negative outer terminal,
Described connection terminal includes that anode connection terminal and negative pole connect terminal,
Described negative outer terminal is made up of the coating member with described aluminium alloy portion and described copper alloy portion, and described copper alloy portion is arranged in described lid side,
Described negative pole connects terminal and is made up of copper alloy, the copper alloy portion of solder joints to described negative outer terminal.
7. rectangular secondary cell as claimed in claim 6, it is characterised in that:
Described negative pole connects terminal and is riveted the exposed surface of the outside side of battery bucket being held within described negative outer terminal.
Illustrate or state (according to the amendment of treaty the 19th article)
Claim:
Claims the 1st to 7 according to PCT treaty the 19th article amendment replace the 1st to 7 of original right requirement book.

Claims (7)

1. a rectangular secondary cell, it is characterised in that including:
There is the generator unit of electrode；
Receive the bucket of described generator unit；
Seal the lid of the opening of described bucket；
The outside terminal covered described in being arranged in；
The collector body being connected respectively with each electrode of described generator unit；With
Through described lid and connect the connection terminal between described collector body and described outside terminal,
Described outside terminal is made up of coating member, and described coating member has the writing board shape along described lid configuration, and two flat parts being made up of dissimilar metal each other of described coating member utilize wide bread each other to cover joint,
Described connection terminal and the flat part solder joints being arranged in described lid side in two flat parts of described outside terminal.
2. rectangular secondary cell as claimed in claim 1, it is characterised in that:
Described outside terminal has the outside terminal connecting portion being hollowly formed at the flat part being arranged in described lid side,
The state that described connection terminal is embedded into described outside terminal connecting portion with cardinal extremity is hermetically laser welded.
3. rectangular secondary cell as claimed in claim 2, it is characterised in that:
Described outside terminal connecting portion has the recess of circle, and described recess diameter is certain and has prescribed depth,
Described connection terminal has the axle portion that inserts inserting in the through hole being opened on described lid and inserts, at this, the flange portion that the cardinal extremity in axle portion is expanding,
The flange portion of described connection terminal is embedded into the recess of described outside terminal connecting portion, and the outer peripheral face of this flange portion is hermetically laser welded together with the boundary member of the inner peripheral surface of described recess.
4. rectangular secondary cell as claimed in claim 3, it is characterised in that:
There is the pad being clipped between described connection terminal and described lid,
At least one party in described connection terminal and described lid is provided with the convex strip portions for forming seal point.
5. rectangular secondary cell as claimed in claim 4, it is characterised in that:
Said two alloy portion is aluminium alloy portion and copper alloy portion.
6. rectangular secondary cell as claimed in claim 5, it is characterised in that:
Described outside terminal includes positive pole outside terminal and negative outer terminal,
Described connection terminal includes that anode connection terminal and negative pole connect terminal,
Described negative outer terminal is made up of the coating member with described aluminium alloy portion and described copper alloy portion, and described copper alloy portion is arranged in described lid side,
Described negative pole connects terminal and is made up of copper alloy, the copper alloy portion of solder joints to described negative outer terminal.
7. rectangular secondary cell as claimed in claim 6, it is characterised in that:
Described negative pole connects terminal and is riveted the exposed surface of the outside side of battery bucket being held within described negative outer terminal.
CN201380079992.5A 2013-10-25 2013-10-25 Rectangular secondary cell Active CN105830253B (en)

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US9923186B2 (en) 2018-03-20
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JPWO2015059826A1 (en) 2017-03-09
EP3062370A1 (en) 2016-08-31
CN105830253B (en) 2019-04-02
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JP6093874B2 (en) 2017-03-08
EP3062370A4 (en) 2017-04-19

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